50 MATERIALS TOWARDS A HISTORY 



LEIOPUS, Scrv. Ann. Ent. Fr., iv. 86. Muls., 149. 



145. L. SYMMETRICIS. 



Cinereous hairy above, with oblong, brown maculae; beneath testaceous. 3j'"long; (elytra 2i,) 1 wide. 

 Cerambyx symetrus, Knock. Mels. Cat., No. 736. Leiopus gilvicornis, Dej. Catalogue. 



Front slightly hairy, medial line impressed, mouth testaceous: pronotum cinereous, a brown band each side of 

 the middle; elytra separately rounded at tip; pale cinereous; outer margin brown; a small, oval, brown spot at 

 the base; a lengthened one in the middle, very near the suture, and a minute one at the apex: feet dull reddish- 

 brown, extremity of the tibire blackish. 



Var. L. confluens. Every portion paler, allowing less contrast in the colours of the elytra, which have but 

 little cinereous, the spots being confluent with the brown of the margin, leaving a large, common, cinereous spot 

 about the middle, and a smaller one near the apex. 



146. LJ spinosus, Say. (Lamia.) Journ. Acad. N. Sc., v. 271. Mels. Cat., No. 770. 



EXOCENTRUS, Muls., 152, pi. 3, tig. 3. 



147. E. dasycerus, Say. (Lamia.) Journ. Acad. N. Sc, v. 270. E. humilis, Dej. 



Inhabits Massachusetts, Pennsylvania, and Carolina, appearing in June. Boston Collection, No. 552. 



148. E. exiguus, Dej. Cat. 1-i'" long. 



149. E. obscurus. 



Dark -brown, elytra with dilated, impressed punctures, and two costoe, exclusive of a sutural one. 



3f" long; (elytra 2j,) lj wide. Pennsylvania. Cabinet of the Reverend D. Ziegler. 



Frontal line impressed throughout; a tubercle each side of it on the vertex; antennas dark testaceous, indistinctly 

 annulate; trophi rufous: elytra scarcely truncate, two small black spots side by side, near the posterior extremity: 

 metasternum cinereous hairy, spotted with blackish : feet dark-brownish rufous. 



This species is at first view distinguished from dasycerus, by the superior size and 

 darker colour. 



POGONOCIIERUS, Lair. ,Serv. Muls., 155, pi. iii. fig. 4. 



1 50. P. MIXTUS. 



Head and thorax blackish-brown, sparsely covered with erect hairs; elytra brown, varied with yellowish cine- 

 reous. 2j'" long. Inhabits Pennsylvania. Cab. Melsheimer. 



Head sparsely hairy, black, with an indistinct, yellowish spot before the eyes; frontal line impressed; antennir 

 testaceous, with the tip of the articulations blackish; scute! black: elytra hispid; base, middle, and apex brown: 

 extreme tip and an oblique band before the middle running forwards and outwards, yellowish, with a few brown 

 dots; extreme base testaceous: feet brown, varied with testaceous. 



The thoracic tubercles arc rather prominent. 



151. P. vestitus, Say. (Saperda.) Journ. Acad. N. Sc, v. 273. Inhabits Alabama. 

 This is a very different insect from the Saperda vestita, Say. Long's Expedition, ii. 290. 



DESMIPHOR \, .Serf. 

 1 52. D. tomentosa. 



Rufo-testaceous, head and prothorax reddish-brown; every part covered with erect hairs. 

 3"' long; (elytra 2\,) 1 wide. D. tomentosa, Dej. Cat. Cab. Lc Conte. 



Prothorax with confluent, impressed punctures, and a prominent lateral spine behind the middle: elytra with 

 piliferous punctures, and a few indistinct tufts of yellowish hair; apex entire. 



